[PATCH] Link against standalone error library if available

[parona]

Hi,

On Monday, January 27th, 2025 at 10:40 PM, Mark Wielaard <mark@klomp.org> wrote:
> My main question/confusion is where the error.h include comes from.
> elfutils does support libcs like musl who don't provide error.h but do
> provide err.h. Then the build should provide its own error function
> through lib/system.h.

Normally there would be no error.h meaning it would use the err.h approach with functions from lib/system.h.

The new variable is that some packages have started to require sys-libs/error-standalone which installs its own error.h, but requiring explicit linkage just like argp-standalone and fts-standalone. This leads to the error.h check to pass and lib/system.h error functions don't get used (ultimately leading to a linking error).

> So maybe our configure check is wrong and it should just test whether
> there is an error.h but also if you can link the result?

Included patch that checks if the symbol is available before defining HAVE_ERROR_H. This would also work, and wouldn't add a new automagic dependency on musl.
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